export default {
  namespaced:true,
  state:()=>({
    cart:JSON.parse(uni.getStorageSync('cart') || '[]'),
  }),
  mutations:{
    addToCart(state,goods){
      const findResult = state.cart.find(x=>x.goods_id===goods.goods_id)
      
      if(!findResult){
        state.cart.push(goods)
      }else{
        findResult.goods_count++
      }
      this.commit('m_cart/saveToStorage')
    },
    saveToStorage (state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    updateGoodsState(state, goods) {
      // 根据 goods_id 查询购物车中对应商品的信息对象
      const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
    
      // 有对应的商品信息对象
      if (findResult) {
        // 更新对应商品的勾选状态
        findResult.goods_state = goods.goods_state
        // 持久化存储到本地
        this.commit('m_cart/saveToStorage')
      }
    },
    updateGoodsCount(state,goods){
       const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
       if(findResult){
         findResult.goods_count = goods.goods_count
          this.commit('m_cart/saveToStorage')
       }
    },
    removeGoodsId(state,goods_id){
      state.cart = state.cart.filter(x=>x.goods_id!==goods_id)
       this.commit('m_cart/saveToStorage')
    },
    updateAllGoodsState(state,newState){
      state.cart.forEach(x=>x.goods_state = newState)
       this.commit('m_cart/saveToStorage')
    }
   
  },
  getters:{
    total(state){
      // let c=0
      // state.cart.forEach(goods=>c+=goods.goods_count)
      // return c
     return state.cart.reduce((total,item)=>total+=item.goods_count,0)
    },
    checkedCount(state){
      return state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count,0)
    },
    checkedGoodsAmount(state){
    return  state.cart.filter(x=>x.goods_state).reduce((total,item)=>total+=item.goods_count * item.goods_price,0).toFixed(2)  
      }
    
  }
}